Ammonites have been understood to humanity for countless years. They are the source of many stories and myths. The name of this spiral-shelled cephalopod comes from the Egyptian god Ammon. Ammon was envisioned as a male with the horns of a ram protruding from his head. The curled ammonite shells resembled the horns and were called Ammon's Stones or ammonites. Ammonites have been known to mankind for thousands of years. The curled ammonite shells resembled the horns and were called Ammon's Stones or ammonites.
Numerous cultures throughout history have attributed special powers to this fossil.
In ancient Greece, it was said that if you put an ammonite under your pillow it would cure sleeping disorders and bring excellent dreams.
If you put a golden ammonite (pryritized) under your pillow you would have prophetic dreams, the Romans believed that.
A Brief History of Ammonites
Ammonites first appeared in the Devonian Period. Early curled species had simple septa with a single arc like the members of the class orthocerida. Ammonites of later durations established septa that had actually intricate folds called lobes and saddles. They also established fragile lacey patterns on the external shell. These patterns in addition to the shape of the shell and the structure of the septa are how this cephalopod is categorized. Ammonites such as Speetoniceras subinversum are great showcase to a fossil collection often on sale.
Considering that all living cephalopods (nautilus, octopus, and squid) are predators, we can presume that ammonites were also. The only living cephalopod with an external shell is the chambered nautilus. It can swim and manage its depth. It does useful content this by utilizing the siphuncle. The siphuncle is a tube that links all the chambers in the shell with the living animal. The nautilus can subtract or include gas in these chambers to manage buoyancy.
Ammonites have a wide range of size. Early ammonites, till the middle Jurassic, were smaller sized, normally less than 9 inches or 23 centimeters.
The difficult shell of the ammonite was quickly fossilized. This, combined with the sheer abundance of this group of cephalopods and its evolutionary period through numerous geologic periods, make it an excellent index fossil. If you find an ammonite from a genus known to be from the Triassic Period, then the rock layer it came from must be Triassic.
It needs to have wide circulation.
There need to be a great deal of them.
It should come from a group that evolves quickly.
They should be easy to acknowledge.
Ammonites please all of the above criteria easily.
Extinction of The Ammonites
The end of the Cretaceous Period was also the end of the ammonites. Dinosaurs and numerous other species of animals and plants passed away out at about this very same time.
The curled ammonite shells looked like the horns and were called Ammon's Stones or ammonites.
Ammonites of later durations established septa that had actually elaborate folds called saddles and lobes. The tough shell of the ammonite was easily fossilized. If you find an ammonite from a genus understood to be from the Triassic Period, then the rock layer it came from should be Triassic. The end of the Cretaceous Period was likewise the end of the ammonites.